CN104296927A - Electric main shaft dynamic balance performance test experimental system - Google Patents
Electric main shaft dynamic balance performance test experimental system Download PDFInfo
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- CN104296927A CN104296927A CN201410538659.2A CN201410538659A CN104296927A CN 104296927 A CN104296927 A CN 104296927A CN 201410538659 A CN201410538659 A CN 201410538659A CN 104296927 A CN104296927 A CN 104296927A
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Abstract
The invention discloses an electric main shaft dynamic balance performance test experimental system. The electric main shaft dynamic balance performance test experimental system comprises a vibration attenuation experimental table, a high-speed electric main shaft, a plurality of balance counter weights, four vibration displacement sensors, two vibration acceleration sensors, a high-rotating-speed sensor, two vibration displacement sensor supports, two dynamic balance adjusting discs, a cutter, a synchronous data collecting card, a computer, a frequency conversion driver used for adjusting the rotating speed of a rotor on the high-speed electric main shaft, an oil-air lubricator used for conducting oil-air lubrication on a bearing of the high-speed electric main shaft and a recirculation cooler used for cooling the high-speed electric main shaft. By means of the electric main shaft dynamic balance performance test experimental system, the high-speed electric main shaft can be completely and comprehensively simulated; in addition, the electric main shaft dynamic balance performance testing can be achieved, and effectiveness of a dynamic balance method can be verified through the experimental system.
Description
Technical field
The present invention relates to a kind of monitoring experiment system, be specifically related to a kind of electro spindle dynamic balance performance testing experimental system.
Background technology
Equipment manufacture is all the mainstay industry of national economy and industrial circle all the time, the important core realizing equipment manufacturing is exactly precise numerical control machine, the machining precision of precise numerical control machine depends on the performance of electro spindle, meanwhile, High-speed machining effectively can promote the raising of production efficiency with it, improve many-sided advantages such as the surface quality of processing work, more and more manufactured field apply, this development being high-speed electric main shaft 1 serves important impetus, also be the design of electro spindle simultaneously, manufacture, application and measuring technology bring huge challenge.
Because the factors such as material, assembling, wearing and tearing cause electro spindle to certainly exist imbalance, this causes great impact to the dynamic perfromance in electro spindle operation process, especially under the condition of high-speed cruising, imbalance not only will can bring the reduction of machining precision, electro spindle also can be made to be difficult to reach higher rotating speed, serious more will cause security incident, in such cases can Measurement accuracy high-speed electric main shaft 1 dynamic perfromance especially dynamic balance performance be extremely important.
At present, domestic also do not have to meet industry spot high speed, high precision electro spindle dynamic balance Performance Test System, and existing electro spindle dynamic balance performance testing experimental system has the following disadvantages usually:
1) the test rotating speed that test macro is applicable is lower, often can not be applicable to the actual needs of the dynamic balance performance test of high-speed electric main shaft 1;
2) the electro spindle rotating speed that adopts of High-speed machining is higher, utilize during experimental system simulated field environment and should select the electro spindle with higher rotation speed, and the speed of mainshaft that existing performance test experimental system adopts is lower, be difficult to the needs meeting the environmental simulation that high-speed electric main shaft 1 is tested;
3) test event of existing dynamic balance performance testing experimental system is single, a kind of expression way of physical quantity is often only adopted to be described dynamic balance performance, and spindle dynamic balance performance can be embodied in many aspects, therefore traditional dynamic balance performance testing experimental system cannot realize comprehensive, the objectivity stated;
4) under actual machining state, the imbalance of main shaft is probably because the wearing and tearing of cutter, breakage cause, and existing dynamic balance performance testing experimental system does not possess the unbalance analog functuion of cutter, cannot meet by experimental system to the actual desirability strided forward of industry;
5) existing dynamic balance performance testing experimental system often structurally more complicated, and functionally relatively simple, and system performance is not fully used;
6) for the test of electro spindle dynamic balance performance, can the vibration that produces due to imbalance of Obtaining Accurate carry out reasonably analyzing of crucial importance to data, and existing dynamic balance performance test macro is complicated for the processing mode of data, lower to the efficiency of Data Analysis Services, the precision of the main shaft amount of unbalance utilizing test data to obtain is poor.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of electro spindle dynamic balance performance testing experimental system, this system can realize complete, comprehensively, accurately to the simulation of high-speed electric main shaft.
For achieving the above object, electro spindle dynamic balance performance testing experimental system of the present invention comprises damping experiment platform, high-speed electric main shaft, some counterweights, four vibration displacement sensors, two vibration acceleration sensors, high speed speed probe, two vibration displacement sensor stands, two transient equilibrium adjustment disks, cutter, simultaneous data-acquisition, computing machine, for regulating the variable frequency drives of the rotating speed of high-speed electric main shaft upper rotor part, for carrying out the oil-air lubrication device of oil-air lubrication to the bearing of high-speed electric main shaft, and the recirculation cooler for lowering the temperature to high-speed electric main shaft,
Described high-speed electric main shaft is fixed on damping experiment platform, two transient equilibrium adjustment disks are socketed on the side of the two ends of rotor of high-speed electric main shaft respectively, vibration acceleration sensor is installed on the axle housing side of high-speed electric main shaft, and vibration acceleration sensor is just to the bearing in high-speed electric main shaft;
Described two transient equilibrium adjustment disks are socketed on the side of the two ends of rotor of high-speed electric main shaft respectively, transient equilibrium adjustment disk is provided with equally distributed some mounting holes for installing counterweight, each mounting hole is uniformly distributed in the side of transient equilibrium adjustment disk, and the axis of each mounting hole is identical to the distance of high-speed electric main shaft upper rotor part;
Described two vibration displacement sensor stands are connected with the end face at axle housing two ends on high-speed electric main shaft respectively, two vibration displacement sensors are fixed on a vibration displacement sensor stand, two other vibration displacement sensor is fixed on another vibration displacement sensor stand, two vibration displacement sensors on same vibration displacement sensor stand are mutually vertical, and four vibration displacement sensors all point to the axis of high-speed electric main shaft;
Described high speed speed probe is fixed on the side of high-speed electric main shaft upper rotor part rear end, and the front end surface of high-speed electric main shaft upper rotor part is provided with the handle of a knife interface for mounting cutter;
The input end of described computing machine is connected by the output terminal of simultaneous data-acquisition with the output terminal of vibration displacement sensing, the output terminal of vibration acceleration sensor and high speed speed probe.
Also comprise the front support stand for supporting described high-speed electric main shaft and rear support stand, one end of front support stand and one end of rear support stand are all connected with the top of damping experiment platform, and the other end of front support stand and the other end of rear support stand are connected with the side of axle housing on high-speed electric main shaft.
The top of described damping experiment platform is provided with groove.
On described high-speed electric main shaft, the end face at axle housing two ends is provided with threaded mounting hole, vibration displacement sensor stand is provided with some first countersunk head through holes vertically, and vibration displacement sensor stand is fixed on the end face of the axle housing on high-speed electric main shaft through described first countersunk head through hole and threaded mounting hole by countersunk head successively;
The side of described vibration displacement sensor stand has been disposed radially the first threaded hole, and the probe of vibration displacement sensor is provided with the external thread closed with described first corresponding threaded holes.
Described cutter comprises handle of a knife, milling cutter and some blades, one end of handle of a knife is fixed on the front end face of the rotor of high-speed electric main shaft by handle of a knife interface, the other end of handle of a knife is connected with milling cutter, milling cutter is provided with some second threaded holes, blade offers the second countersunk head through hole, blade is fixed on milling cutter through the second countersunk head through hole and the second threaded hole by screw successively.
The output terminal of described vibration displacement sensor passes conditioner by displacement signal and is connected with simultaneous data-acquisition.
The output terminal of described vibration acceleration sensor is connected with simultaneous data-acquisition by acceleration transducer conditioner.
The output terminal of described simultaneous data-acquisition is connected by data-interface converter with computing machine, simultaneous data-acquisition is connected with data-interface converter by PXI high speed interface, and data-interface converter is connected with the input end of computing machine by EXPRESS data-interface.
Described front support stand and rear support stand are all fixed on damping experiment platform by T grooved screw and set nut.
Described vibration acceleration sensor by magnet adsorption on the axle housing of high-speed electric main shaft.
The present invention has following beneficial effect:
Electro spindle dynamic balance performance testing experimental system of the present invention is in test process, the speed of high-speed electric main shaft is regulated by variable frequency drives, detected the rotor speed of high-speed electric main shaft by high speed speed probe simultaneously, the vibration information of high-speed electric main shaft is detected by vibration displacement sensor, and the acceleration information of high-speed electric main shaft is detected by vibration acceleration sensor, thus comprehensively detect the indices of high-speed electric main shaft, simultaneously detect by be realized collection and the transmission of data by simultaneous data-acquisition, thus improve the degree of accuracy of data acquisition, for the test of high-speed electric main shaft balance quality provides necessary data basis.In addition, high-speed electric main shaft dynamic balance performance regulatory function is realized by transient equilibrium adjustment disk, necessary experiment condition can be provided for the test of high-speed electric main shaft dynamic balance performance and dynamic balance method checking, and by the state changing tooling system, the impact produced due to cutter in the actual processing of electro spindle be simulated.Meanwhile, to be connected with the front end face of high-speed electric main shaft upper rotor part the unbalance analog functuion fetching and simulate actual machining state bottom tool by cutter.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of handle of a knife 19 in the present invention;
Fig. 3 is the structural representation of milling cutter 20 in the present invention;
Fig. 4 is circuit theory diagrams of the present invention.
Wherein, 1 is high-speed electric main shaft, 2 is front support stand, 3 is rear support stand, 4 is damping experiment platform, 5 is variable frequency drives, 6 is oil-air lubrication device, 7 is recirculation cooler, 8 is vibration acceleration sensing, 9 is vibration displacement sensor, 10 is high speed speed probe, 11 is bearing, 12 is vibration displacement sensor stand, 13 is threaded mounting hole, 14 is the first countersunk head through hole, 15 is the first threaded hole, 16 is transient equilibrium adjustment disk, 17 is rotor, 18 is handle of a knife interface, 19 is handle of a knife, 20 is milling cutter, 21 is blade, 22 is the second countersunk head through hole, 23 is the probe of high speed speed probe, 24 is acceleration transducer conditioner, 25 is simultaneous data-acquisition, 26 is displacement signal conditioner, 27 is anti-tampering connection, 28 is data-interface converter, 29 is computing machine.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, Fig. 2, Fig. 3 and Fig. 4, electro spindle dynamic balance performance testing experimental system of the present invention comprises damping experiment platform 4, high-speed electric main shaft 1, some counterweights, four vibration displacement sensors 9, two vibration acceleration sensors 8, high speed speed probe 10, two vibration displacement sensor stands 12, two transient equilibrium adjustment disks 16, cutter, simultaneous data-acquisition 25, computing machine 29, for regulating the variable frequency drives 5 of the rotating speed of high-speed electric main shaft 1 upper rotor part 17, for carrying out the oil-air lubrication device 6 of oil-air lubrication to the bearing 11 of high-speed electric main shaft 1, and the recirculation cooler 7 for lowering the temperature to high-speed electric main shaft 1.
Described high-speed electric main shaft 1 is fixed on damping experiment platform 4, two transient equilibrium adjustment disks 16 are socketed on the side at rotor 17 two ends of high-speed electric main shaft 1 respectively, vibration acceleration sensor 8 is installed on the axle housing side of high-speed electric main shaft 1, and vibration acceleration sensor 8 is just to the bearing 11 in high-speed electric main shaft 1, it should be noted that, described vibration acceleration sensor 8 adopts the ICP-352C33 type sensor of PCB company, described vibration acceleration sensor 8 has the sensitivity of 100mV/g and the test specification of ± 50g, on vibration acceleration sensor 8 installation site utilizing the form of magnet adsorption to be fixed on to provide outside the axle housing of high-speed electric main shaft 1, and be connected with acceleration transducer conditioner 24, described acceleration transducer conditioner 24 selects the 482C05 type acceleration signal conditioner of PCB company, for powering for vibration acceleration sensor 8, vibration acceleration signal is amplified conditioning, be connected with simultaneous data-acquisition 25, by simultaneous data-acquisition 25, vibration acceleration information is forwarded in computing machine 29.
Described two transient equilibrium adjustment disks 16 are socketed on the side at rotor 17 two ends of high-speed electric main shaft 1 respectively, transient equilibrium adjustment disk 16 is provided with equally distributed some mounting holes for installing counterweight, each mounting hole is uniformly distributed in the side of transient equilibrium adjustment disk 16, and the axis of each mounting hole is identical to the distance of high-speed electric main shaft 1 upper rotor part 17; When transient equilibrium adjusts, changed the equilibrium state of electro spindle by the mode of adding counterweight screws in the mounting hole of transient equilibrium adjustment disk 16, the imbalance compensation of high-speed electric main shaft 1 can be realized, and also can realize the unbalanced simulation of high-speed electric main shaft 1.
Described two vibration displacement sensor stands 12 are connected with the end face at axle housing two ends on high-speed electric main shaft 1 respectively, two vibration displacement sensors 9 are fixed on a vibration displacement sensor stand 12, two other vibration displacement sensor 9 is fixed on another vibration displacement sensor stand 12, two vibration displacement sensors 9 on same vibration displacement sensor stand 12 are mutually vertical, and four vibration displacement sensors 9 all point to the axis of high-speed electric main shaft 1; It should be noted that, described vibration displacement sensor 9 is connected with displacement signal conditioner 26, institute's displacement signal conditioner 26 selects the eddyNCDT3010 type signal conditioner of meter Yi company, for powering for vibration displacement sensor 9, vibration displacement sensor 9 signal is amplified conditioning, and adopt anti-tampering connection 27 to be connected between each displacement signal conditioner 26, prevent from interference mutually occurs between displacement transducer, last each displacement signal conditioner 26 is connected with high-speed synchronous data acquiring card 25 respectively.
Described high speed speed probe 10 is fixed on the side of high-speed electric main shaft 1 upper rotor part 17 rear end, and the front end surface of high-speed electric main shaft 1 upper rotor part 17 is provided with the handle of a knife interface 18 for mounting cutter; The input end of computing machine 29 is connected by the output terminal of simultaneous data-acquisition 25 with the output terminal of vibration displacement sensor 9, the output terminal of vibration acceleration sensor 8 and high speed speed probe 10.It should be noted that, the GEL2442K sensor of Reynolds moral Company selected by described high speed speed probe 10, has several and triggers tooth, and leave the probe that the position of triggering tooth certain distance is high speed speed probe 10, full test rotating speed can reach 10
4r/min, described high speed speed probe 10 is directly connected with high-speed synchronous data acquiring card 25.
In addition, described simultaneous data-acquisition 25 adopts the PXI-4472 data acquisition card of NI company, described simultaneous data-acquisition 25 can realize 8 passage 24 bit synchronization data acquisition functions, maximum sampling rate can reach 102.4kS/s, high speed PXI data transmission interface is utilized to be connected with data-interface converter 28, sampled data is transferred to computing machine 29 by EXPRESS interface by described data-interface converter 28, and then realizes the test of high-speed electric main shaft 1 dynamic balance performance.
It should be noted that, the present invention also comprises front support stand 2 for supporting described high-speed electric main shaft 1 and rear support stand 3, one end of front support stand 2 and one end of rear support stand 3 are all connected with the top of damping experiment platform 4, the other end of front support stand 2 and the other end of rear support stand 3 are connected with the side of axle housing on high-speed electric main shaft 1, the top of damping experiment platform 4 is provided with groove, on high-speed electric main shaft 1, the end face at axle housing two ends is provided with threaded mounting hole 13, vibration displacement sensor stand 12 is provided with some first countersunk head through holes 14 vertically, vibration displacement sensor stand 12 is fixed on the end face of the axle housing on high-speed electric main shaft 1 through described first countersunk head through hole 14 and threaded mounting hole 13 by countersunk head successively, the side of described vibration displacement sensor stand 12 has been disposed radially the first threaded hole 15, and the probe of vibration displacement sensor 9 is provided with the external thread matched with described first threaded hole 15, described cutter comprises handle of a knife 19, milling cutter 20 and some blades 21, one end of handle of a knife 19 is fixed on the front end face of rotor 17 of high-speed electric main shaft 1 by handle of a knife interface 18, the other end of handle of a knife 19 is connected with milling cutter 20, milling cutter 20 is provided with some second threaded holes, blade 21 offers the second countersunk head through hole 22, blade 21 is fixed on milling cutter 20 through the second countersunk head through hole 22 and the second threaded hole by screw successively.It should be noted that, described handle of a knife 19 performs DIN69893 standard, can by changing the electro spindle imbalance that blade 21 state simulation causes due to cutter factor, such as, be arranged on after being polished by one of them blade 21 that milling cutter 20 to simulate the electro spindle caused due to tool wear uneven, or it is uneven etc. blade 21 to be sawed out electro spindle that groove simulation causes due to tool failure.The output terminal of vibration displacement sensor 9 passes conditioner 26 by displacement signal and is connected with simultaneous data-acquisition 25.The output terminal of vibration acceleration sensor 8 is connected with simultaneous data-acquisition 25 by acceleration transducer conditioner 24.The output terminal of simultaneous data-acquisition 25 is connected by data-interface converter 28 with computing machine 29, simultaneous data-acquisition 25 is connected with data-interface converter 28 by PXI high speed interface, and data-interface converter 28 is connected by the input end of EXPRESS data-interface with computing machine 29.Front support stand 2 and rear support stand 3 are all fixed on damping experiment platform 4 by T grooved screw and set nut.Vibration acceleration sensor 8 by magnet adsorption on the axle housing of high-speed electric main shaft 1.
Claims (10)
1. an electro spindle dynamic balance performance testing experimental system, it is characterized in that, comprise damping experiment platform (4), high-speed electric main shaft (1), some counterweights, four vibration displacement sensors (9), two vibration acceleration sensors (8), high speed speed probe (10), two vibration displacement sensor stands (12), two transient equilibrium adjustment disks (16), cutter, simultaneous data-acquisition (25), computing machine (29), for regulating the variable frequency drives (5) of the rotating speed of high-speed electric main shaft (1) upper rotor part (17), the oil-air lubrication device (6) of oil-air lubrication is carried out for the bearing (11) to high-speed electric main shaft (1), and the recirculation cooler (7) for lowering the temperature to high-speed electric main shaft (1),
Described high-speed electric main shaft (1) is fixed on damping experiment platform (4), two transient equilibrium adjustment disks (16) are socketed on the side at rotor (17) two ends of high-speed electric main shaft (1) respectively, vibration acceleration sensor (8) is installed on the axle housing side of high-speed electric main shaft (1), and vibration acceleration sensor (8) is just to the bearing (11) in high-speed electric main shaft (1);
Described two transient equilibrium adjustment disks (16) are socketed on the side at rotor (17) two ends of high-speed electric main shaft (1) respectively, transient equilibrium adjustment disk (16) is provided with equally distributed some mounting holes for installing counterweight, each mounting hole is uniformly distributed in the side of transient equilibrium adjustment disk (16), and the axis of each mounting hole is identical to the distance of high-speed electric main shaft (1) upper rotor part (17);
Described two vibration displacement sensor stands (12) are connected with the end face at axle housing two ends on high-speed electric main shaft (1) respectively, two vibration displacement sensors (9) are fixed on a vibration displacement sensor stand (12), two other vibration displacement sensor (9) is fixed on another vibration displacement sensor stand (12), two vibration displacement sensors (9) on same vibration displacement sensor stand (12) are mutually vertical, and four vibration displacement sensors (9) all point to the axis of high-speed electric main shaft (1);
Described high speed speed probe (10) is fixed on the side of high-speed electric main shaft (1) upper rotor part (17) rear end, and the front end surface of high-speed electric main shaft (1) upper rotor part (17) is provided with the handle of a knife interface (18) for mounting cutter;
The input end of described computing machine (29) is connected by the output terminal of simultaneous data-acquisition (25) with the output terminal of vibration displacement sensor (9), the output terminal of vibration acceleration sensor (8) and high speed speed probe (10).
2. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, also comprise the front support stand (2) for supporting described high-speed electric main shaft (1) and rear support stand (3), one end of front support stand (2) and one end of rear support stand (3) are all connected with the top of damping experiment platform (4), and the other end of front support stand (2) and the other end of rear support stand (3) are connected with the side of the upper axle housing of high-speed electric main shaft (1).
3. electro spindle dynamic balance performance testing experimental system according to claim 1, is characterized in that, the top of described damping experiment platform (4) is provided with groove.
4. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, the end face at the upper axle housing two ends of described high-speed electric main shaft (1) is provided with threaded mounting hole (13), vibration displacement sensor stand (12) is provided with some first countersunk head through holes (14) vertically, and vibration displacement sensor stand (12) is fixed on the end face of the axle housing on high-speed electric main shaft (1) through described first countersunk head through hole (14) and threaded mounting hole (13) by countersunk head successively;
The side of described vibration displacement sensor stand (12) has been disposed radially the first threaded hole (15), and the probe of vibration displacement sensor (9) is provided with the external thread matched with described first threaded hole (15).
5. electro spindle dynamic balance performance testing experimental system according to claim 4, it is characterized in that, described cutter comprises handle of a knife (19), milling cutter (20) and some blades (21), one end of handle of a knife (19) is fixed on the front end face of rotor (17) of high-speed electric main shaft (1) by handle of a knife interface (18), the other end of handle of a knife (19) is connected with milling cutter (20), milling cutter (20) is provided with some second threaded holes, blade (21) offers the second countersunk head through hole (22), blade (21) is fixed on milling cutter (20) through the second countersunk head through hole (22) and the second threaded hole by screw successively.
6. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, the output terminal of described vibration displacement sensor (9) passes conditioner (26) by displacement signal and is connected with simultaneous data-acquisition (25).
7. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, the output terminal of described vibration acceleration sensor (8) is connected with simultaneous data-acquisition (25) by acceleration transducer conditioner (24).
8. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, the output terminal of described simultaneous data-acquisition (25) is connected by data-interface converter (28) with computing machine (29), simultaneous data-acquisition (25) is connected with data-interface converter (28) by PXI high speed interface, and data-interface converter (28) is connected by the input end of EXPRESS data-interface with computing machine (29).
9. electro spindle dynamic balance performance testing experimental system according to claim 1, it is characterized in that, described front support stand (2) and rear support stand (3) are all fixed on damping experiment platform (4) by T grooved screw and set nut.
10. electro spindle dynamic balance performance testing experimental system according to claim 1, is characterized in that, described vibration acceleration sensor (8) by magnet adsorption on the axle housing of high-speed electric main shaft (1).
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| CN107621333A (en) * | 2017-09-30 | 2018-01-23 | 马鞍山马钢华阳设备诊断工程有限公司 | A kind of rotor scene dual-threshold detection calibrating installation for not dismantling test mass and method |
| CN108332969A (en) * | 2018-04-24 | 2018-07-27 | 浙江大学昆山创新中心 | A kind of electro spindle comprehensive performance testing system |
| CN109799036A (en) * | 2019-01-08 | 2019-05-24 | 宁波朗迪叶轮机械有限公司 | A kind of automatic balancing machine and its dynamic balancing detection, collocation structure |
| CN110057498A (en) * | 2019-05-10 | 2019-07-26 | 中国航发航空科技股份有限公司 | A kind of device for engine blower booster stage rotor balancing test |
| CN113432789A (en) * | 2021-06-30 | 2021-09-24 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Online testing device and method for dynamic balance weight of rotary machine |
| CN113432789B (en) * | 2021-06-30 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Online testing device and method for dynamic balance weight of rotary machine |
| CN115284073A (en) * | 2022-07-26 | 2022-11-04 | 武汉重型机床集团有限公司 | Dynamic balance measuring device and method for three-point support of spindle milling transmission shaft |
| CN118010249A (en) * | 2024-04-10 | 2024-05-10 | 摩多利智能传动(江苏)有限公司 | Dynamic balance testing device for planetary reducer |
| CN118010249B (en) * | 2024-04-10 | 2024-06-28 | 摩多利智能传动(江苏)有限公司 | Dynamic balance testing device for planetary reducer |
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